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Analog Devices Inc. LT8390EUFD#WTRPBF
- Part No.:
- LT8390EUFD#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390EUFD#WTRPBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST CNT
- Quantity:
- Payment:
- Shipping:
Inventory:2,915
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Product details
Overview
LT8390EUFD#WTRPBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V–60V input and 0V–60V output, with ±1.5% VOUT accuracy, 150kHz–650kHz adjustable switching frequency, and spread-spectrum EMI reduction. It regulates voltage or input/output current in automotive battery chargers, industrial power supplies, and telecom voltage regulators where VIN may be above, below, or equal to VOUT.
For engineers reviewing the LT8390EUFD#WTRPBF datasheet, LT8390EUFD#WTRPBF pinout, LT8390EUFD#WTRPBF application, or LT8390EUFD#WTRPBF equivalent, key selection criteria include its peak-buck/peak-boost current mode control, integrated bootstrap diodes, high-side PMOS load switch driver (LOADTG), AEC-Q100 qualification for automotive use, and QFN-28 (4mm × 5mm) package with exposed thermal pad.
Technical Context
The LT8390EUFD#WTRPBF implements a proprietary dual-mode current sensing architecture using a single inductor current sense resistor (LSP/LSN) and separate ISP/ISN inputs for precise input/output current regulation. Its control logic dynamically selects between peak-buck and peak-boost modes based on real-time VIN/VOUT ratio - transitioning seamlessly across buck (VIN/VOUT > 1.33), buck-boost (0.75 < VIN/VOUT < 1.18), and boost (VIN/VOUT < 0.85) regions with hysteresis to prevent chattering.
It integrates two independent gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), internal 5V INTVCC LDO, 2V VREF reference, and fault protection including PGOOD flag, FB overvoltage/short detection, and configurable short-circuit response (hiccup/latch-off/keep-running). Spread spectrum modulation is enabled via SYNC/SPRD pin tied to INTVCC, delivering ±15% triangle frequency dithering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range sources including 12V/24V/48V automotive batteries and industrial rails. |
| Output Voltage Range | 0V to 60V - enables bidirectional regulation and supercapacitor charging without polarity reversal. |
| VOUT Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable feedback loop performance across full operating range. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT resistor or external sync clock) - balances efficiency, size, and EMI compliance. |
| Current Sense Accuracy | ±3% for input/output current monitoring (ISP/ISN) - enables precise CC/CV battery charging and load protection. |
| Thermal Rating | –40°C to +125°C junction temperature - qualified for under-hood automotive and harsh industrial environments. |
| EMI Reduction | Internal ±15% triangle spread spectrum (via SYNC/SPRD = INTVCC) - lowers peak radiated emissions without external components. |
Pinout & Package
LT8390EUFD#WTRPBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND), θJA = 43°C/W, θJC = 3.4°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Buck/Boost switch nodes | Connect to external MOSFETs; swing from Schottky drop below GND to VIN (SW1) or VOUT (SW2); require Kelvin layout for low-noise sensing. |
| TG1 / TG2 | Top N-MOS gate drivers | Drive buck/boost high-side FETs with rail-to-rail swing (SWx to BSTx); support fast 25ns rise/fall times into 3.3nF loads. |
| BG1 / BG2 | Bottom N-MOS gate drivers | Drive buck/boost low-side FETs from GND to INTVCC; integrate shoot-through protection with 60ns dead-time control. |
| LSP / LSN | Buck-side inductor current sense | Kelvin-connected inputs for accurate inductor current measurement in all operating regions; ±1mV reverse threshold. |
| ISP / ISN | Input/output current sense | Separate high-accuracy current monitor path; supports programmable 5mV–100mV threshold via CTRL pin; ±3% accuracy over temp. |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables external PMOS; LOADTG provides buffered inverted drive (VOUT–5V to VOUT) with 90ns turn-on propagation. |
| FB / VC / SS / RT | Feedback, error amp, soft-start, freq set | FB sets 1.00V regulation point; VC interfaces with RC compensation network; SS enables soft-start timing and fault mode selection; RT sets oscillator frequency. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor topology | Eliminates need for separate buck/boost ICs or complex multi-phase designs; reduces BOM count and board area in space-constrained systems. |
| Seamless region transition | Zero-crossing hysteresis and dynamic mode selection ensure no output glitch or audible noise during VIN/VOUT crossover (e.g., cold-cranking in automotive). |
| Integrated bootstrap diodes (BST1/BST2) | Removes requirement for external Schottky diodes; simplifies layout and improves reliability in high-temp environments where discrete diodes degrade. |
| AEC-Q100 Grade E (–40°C to +125°C) | Validated for automotive powertrain and body electronics; includes HTOL, TC, and ESD testing per stress test plan. |
| Configurable short-circuit protection | Single resistor from SS to VREF selects hiccup (no resistor), latch-off (499kΩ), or keep-running (100kΩ) behavior - enabling system-level fault strategy alignment. |
| High-side PMOS load switch driver | Enables controlled hot-swap and inrush limiting; LOADTG drives external PMOS with rail-referenced gate voltage, eliminating level-shifter complexity. |
Applications
| Automotive Battery Charger | Industrial 24V/48V Power Supply |
|---|---|
Use Scenario: Charging 12V lead-acid or LiFePO4 battery from variable 9V–60V vehicle bus during engine start-stop cycles. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller regulating constant-current/constant-voltage charge profile with seamless VIN/VOUT transition. Use Value: Maintains regulated output down to 9V input (cold crank), avoids dropout or reset during transients, and delivers 98% peak efficiency at 4A/12V. |
Use Scenario: Providing stable 24V output from unregulated 18V–56V industrial DC bus powering PLC I/O modules and sensors. IC Role / Device Role / Timing Role: Primary DC/DC controller managing wide-input regulation, input current limiting, and PGOOD signaling for downstream sequencing. Use Value: ±1.5% VOUT accuracy ensures sensor bias stability; ±3% ISP/ISN monitoring enables real-time load diagnostics and overcurrent shutdown. |
| Telecom 48V Backup System | Supercapacitor Energy Buffer |
Use Scenario: Bidirectional power conversion between 48V telecom rectifier and backup supercapacitor bank during AC failure. IC Role / Device Role / Timing Role: Voltage-regulating buck-boost controller with programmable input current limit and reverse current blocking. Use Value: Supports zero-voltage switching transitions during direction reversal; spread spectrum reduces conducted EMI in dense telecom shelves. |
Use Scenario: Charging/discharging 2.7V–5.4V supercapacitor stack from 12V system rail in energy-harvesting IoT gateway. IC Role / Device Role / Timing Role: High-efficiency bidirectional regulator with precise current control for safe capacitor C-rate management. Use Value: 100mV full-scale ISP/ISN threshold enables 10mA–10A current sensing range; VOUT-disconnect-on-shutdown prevents leakage during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8705IUFD#PBF | Wider 2.8V–80V input, no spread spectrum, no integrated ISP/ISN monitor, requires external current sense amplifier. | Preferred for ultra-wide-input industrial converters where EMI is less critical and current monitoring is handled externally. | Choose LT8705 when input exceeds 60V or when lower cost justifies added external components for current sensing. |
| MPQ4420AGU-AEC1-P | 3.3V–60V input, fixed 2MHz frequency, no spread spectrum, no ISP/ISN inputs, only VOUT regulation (no input current control). | Suitable for compact consumer-grade buck-boost supplies where only output voltage regulation is required. | Choose MPQ4420A for cost-sensitive, space-constrained applications lacking need for input current control or automotive qualification. |
Compared with LT8705IUFD#PBF and MPQ4420AGU-AEC1-P, the LT8390EUFD#WTRPBF uniquely combines AEC-Q100 qualification, integrated ISP/ISN current monitoring, spread-spectrum EMI reduction, and seamless buck/buck-boost/boost transitions - making it optimal for automotive battery management and mission-critical industrial power systems requiring both voltage and current regulation.
Availability
LT8390EUFD#WTRPBF is available at Aetrix Electronics and suitable for automotive battery chargers, industrial 24V/48V power supplies, telecom backup systems, and supercapacitor energy buffers requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8390EUFD#WTRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LT8390EUFD#WTRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive and industrial applications requiring wide input/output ranges, robust fault protection, and low-EMI operation.
FAQ
What is the maximum output current capability of the LT8390EUFD#WTRPBF?
The LT8390EUFD#WTRPBF itself is a controller IC and does not define maximum output current - that is determined by external MOSFETs, inductor, and layout. However, the datasheet demonstrates 4A continuous output (12V @ 48W) with 98% efficiency. Its current sense thresholds (e.g., 100mV full scale on ISP/ISN) support precise regulation up to ~10A with appropriate RSENSE selection and thermal design.
Does the LT8390EUFD#WTRPBF support both buck and boost operation in the same design?
Yes - the LT8390EUFD#WTRPBF is a true 4-switch synchronous buck-boost controller that automatically and seamlessly transitions between buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT) modes using a single inductor. Its proprietary peak-buck/peak-boost current mode control ensures no output disturbance during region crossovers, validated across VIN/VOUT ratios from 0.73 to 1.35.
How is spread spectrum EMI reduction implemented in the LT8390EUFD#WTRPBF?
Spread spectrum is enabled by tying the SYNC/SPRD pin to INTVCC, which activates internal ±15% triangle modulation of the oscillator frequency. This dithers the switching frequency continuously around the nominal value set by the RT resistor, spreading energy across a wider bandwidth and reducing peak radiated/conducted EMI - eliminating need for external filters in many automotive and industrial EMC-compliant designs.
What is the function of the LOADTG pin on the LT8390EUFD#WTRPBF?
The LOADTG pin is a buffered, inverted output of the LOADEN signal, designed to drive the gate of an external high-side PMOS load switch. It swings from (VOUT – 5V) to VOUT, enabling controlled hot-swap, inrush limiting, and output disconnect. When LOADEN is high, LOADTG turns off the PMOS; when LOADEN is low, LOADTG pulls gate to VOUT, turning on the switch - all without requiring external level shifters.
Is the LT8390EUFD#WTRPBF pin-compatible with other LT8390 variants?
Yes - the LT8390EUFD#WTRPBF shares identical pinout and footprint with all LT8390 UFD-package variants (e.g., LT8390IUFD#TRPBF, LT8390JUFD#TRPBF). Differences lie only in temperature grade (E = –40°C to +125°C) and automotive qualification (W suffix denotes AEC-Q100 compliance). Electrical functionality and layout are fully interchangeable within the UFD package family.
LT8390EUFD#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 190kHz ~ 630kHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT8390EUFD#WTRPBF FAQ
1.How can I place an order for LT8390EUFD#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390EUFD#WTRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT8390EUFD#WTRPBF reliable?
The price and inventory of LT8390EUFD#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390EUFD#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT8390EUFD#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390EUFD#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390EUFD#WTRPBF?
LT8390EUFD#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390EUFD#WTRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT8390EUFD#WTRPBF?
For technical support, including LT8390EUFD#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390EUFD#WTRPBF requirements.
6.How does Aetrix verify that LT8390EUFD#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390EUFD#WTRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT8390EUFD#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT8390EUFD#WTRPBF?
All LT8390EUFD#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390EUFD#WTRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT8390EUFD#WTRPBF part is unused and in its original packaging.
Return procedure for LT8390EUFD#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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